Merge branch 'master' into jgrpp

# Conflicts:
#	cmake/CompileFlags.cmake
#	src/aircraft_cmd.cpp
#	src/blitter/32bpp_anim.cpp
#	src/cargopacket.cpp
#	src/cheat_gui.cpp
#	src/company_cmd.cpp
#	src/company_gui.cpp
#	src/core/pool_func.hpp
#	src/date.cpp
#	src/economy.cpp
#	src/error_gui.cpp
#	src/ground_vehicle.cpp
#	src/ground_vehicle.hpp
#	src/group_gui.cpp
#	src/industry_cmd.cpp
#	src/lang/dutch.txt
#	src/lang/french.txt
#	src/lang/german.txt
#	src/linkgraph/linkgraph_gui.cpp
#	src/linkgraph/mcf.cpp
#	src/network/network_content.cpp
#	src/network/network_server.cpp
#	src/network/network_udp.cpp
#	src/newgrf_engine.cpp
#	src/newgrf_station.cpp
#	src/order_cmd.cpp
#	src/order_gui.cpp
#	src/pathfinder/follow_track.hpp
#	src/pathfinder/yapf/yapf_common.hpp
#	src/saveload/saveload.cpp
#	src/settings_gui.cpp
#	src/station_cmd.cpp
#	src/station_kdtree.h
#	src/string_func.h
#	src/table/settings.ini
#	src/tgp.cpp
#	src/timetable_cmd.cpp
#	src/timetable_gui.cpp
#	src/toolbar_gui.cpp
#	src/town_cmd.cpp
#	src/train_cmd.cpp
#	src/train_gui.cpp
#	src/tree_gui.cpp
#	src/tunnelbridge_cmd.cpp
#	src/vehicle.cpp
#	src/vehicle_gui.cpp
#	src/video/sdl2_v.cpp
#	src/video/sdl_v.cpp
#	src/video/win32_v.cpp
#	src/viewport.cpp
#	src/viewport_sprite_sorter_sse4.cpp
#	src/window.cpp

.github/workflows/ci-build.yml

@@ -210,6 +210,18 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v2
 
+    # "restore-cache" which is done by "run-vcpkg" uses Windows tar.
+    # A git clone on windows marks a few files as read-only; when Windows tar
+    # tries to extract the cache over this folder, it fails, despite the files
+    # being identical. This failure shows up as an warning in the logs. We
+    # avoid this by simply removing the read-only mark from the git folder.
+    # In other words: this is a hack!
+    # See: https://github.com/lukka/run-vcpkg/issues/61
+    - name: Remove read-only flag from vcpkg git folder
+      shell: powershell
+      run: |
+        attrib -r "c:\vcpkg\.git\*.*" /s
+
     - name: Prepare vcpkg (with cache)
       uses: lukka/run-vcpkg@v6
       with: